Rapid freezer



Patented oct. 3o, 192s.

FERDINAND FRANZ BENZ, OF HAMBURGrGERMANY.

RAPID FREEZER.

Application filed October 4, 1927. Serial No. 223,945.

- tinguished bygreat resistance and simple and further by covering theinner .surface of said cheap cmistruction, and presents the advantagethat no spare parts are required.

According to the invention the freezer consists of a double-walledevacuated metal vessel, the outer Wall of which, made of light metal forinstance sheet aluminium, isvairtightly solthered together with theinner Wall made of polished Gern'lan silver, and further of an insertionadapted to be closed and serving as mould for the iceblock to beproduced.

-A further feature of the invention is a conical 'airevacuated stopper'1n the open upper end of the inserted mould.

An embodiment of the invention is shown by Way of exan'iple, in theaccompanying drawing in which Fig. 1 `shows the rapid ice-producer inlongitudinal section.

Fig. 2 is a horizontal section through the insertion on line 2-2 of Fig.l.

Fig. 3 is a vertical section showing the stopper for the insertion. i

Fig. et is a side elevation of Fig. 3.

The metal vessel Which is preferably cylindrical has an outer Wall l oflight metal, for instance of aluminium, and an inner wall 2 of Germansilver, the Walls being airtightly connected, the one with the other, bysoldering after the space between the said two Walls has been evacuatedin. order to ensure a good insulation. The insulation can be furtherimproved by covering the outer surface of Wall l with a layer 3 of cork,paper or the like and wall eventually with a lining of the samematerial.

This double-vvalled metal vessel 1, .2 is designed to be filled with thefreezing mixture and specially with a freezing solution of the kind usedgenerally in tropical climates for the production of ice, for instance amixture of ammonium sulphate with soda, or the like. As the inner Wallof the vessel must be specially resistant against the action of thefreezing solution, it is preferably made of polished the upper end, sothat a slightly conical neck 4 is formed, designed to receive thecorresponding conical top portion 6 of the insertion 5. The top edge 7of the top portion 6 is The inner Wall is offset at flanged in outwarddirection to limit the inserting of the insertion and to facilitate theremoval of the same. The insertion proper 5 is conical and haslongitudinal grooves 8 in its inner surface designed to enlarge thesurface upon which the freezing-solution acts and to accelerate thefreezing of the mass in the insertion, for instance water.

The insertion 5 is closed at thc top end by a hollowstopper 9 which isair evacuated and air tightly closed. The stopper is conical andl titstightly into the top portion 6 of the insertion 5. YVhen the stopper 9is pressed into the top portion 6 this top portion, and conse- Aquentlythe insertion 5, is securely fixed -in the neck 4 no rubber packingsorthe like being required Which Would be easily de.

stroyed by thelfreezing-solution, and no other auxiliary means beingrequired which easily deteriorate in tropical climates and are ditlicultto replace.

The top end of the vessel is covered by a cap 11 which rests upon acircular shoulder l2 of the outer Wall l of the vessel.

To use the freezer, freezing solution is filled into the vessel, theinsertion body 5 inserted into the neck 4 and Water orany other massfilled into the insertion, whereupon the stopp-er 9 is inserted. Afterabout 15 to 20 minutes the iceblock can be removed after removing thestopper 9. i

Vhen the freezer' has to be frequently transported it is preferablyenclosed in a sheet ironl casing which may be locked.

I claim A rapid freezer comprising in combination a double-walledevacuated metal vessel for the freezing solution the outer Wall of whichis of light metal, the inner wall being of German silver said inner wallbeing offset at the upper end to form a slight-ly conical neck, aninsertion serving as mould for the iceblock to be produced and tightlyfitting into the neck portion of said Vessel and having longitudinalgrooves pressed in the inner surface to enlarge the surface upon whichsaid freezing solution acts, a .slightly conical portion at the upperend of saidinsertion, tightly fitting into said neck, and an airevacuated air tightly closed conical stopper tightly fitting into thetop portion of said insertion'.l

In testimony whereof I affix Inv signature.

FERDINAND FRANZ BENZ.

Cil

